2005/07/25 Caterpillar

Excavator:

365B L (S/N: AGD1-UP; 4XZ1-UP; 9PZ1-UP; 9TZ1-UP)

365B MH (S/N: CTY1-UP)

365B L Series II (S/N: JMB1-UP; PEG1-UP; BTH1-UP; CFJ1-UP; DER1-UP)

365B MH Series II (S/N: SDL1-UP)

The filter for the pressure signal in the controller may send an unsteady signal to the compensator valve for the swing pump. The unsteady signal produces pressure fluctuations in the swing hydraulic circuit. A new machine software gp is available for the elimination of the unsteady signal. Installation of the new software improves the swing movement.

The new machine software gp that directly replaces the former machine software gp is listed in Table 1. Install the new software if the swing movement is unsteady.

Note: The transition from a one pump flow system to a two pump flow system was effective with 365B L (S/N: 9PZ475-UP; 9TZ531-UP; CTY403-UP) Excavator.

Note: The new automatic lubrication configuration was effective with 365B L Series II (S/N: BTH173-UP) Excavator.